日本金属学会誌

J. Japan Inst. Metals, Vol. 51, No. 3 (1987),
pp. 187-193

Fatigue Crack Growth and Fracture Surface of Clad Steel Plates

Mamoru lshihara1 and Seiji Yasuhara1

1Hiratsuka Research Laboratory, Sumitomo Heavy Industries, Ltd., Hiratsuka

Abstract:

The fatigue crack growth behavior of roll clad steel plate, overlaying clad steel plate, and SM41B, 2\frac14Cr-1Mo steel plates was investigated by use of the surface crack specimens. The fracture surface of these plates was also analyzed quantitatively by using the fractographic method.
The results obtained are summarized as follows.
(1)  For both roll and overlaying clad steels, the fatigue crack growth rate, db/dN, retarded slightly near the clad interface.
(2)  The intergranular facet was observed on the fracture surface of SM41B and base metals of roll clad steel and overlaying clad steel. In all cases, the shape of its observed region was half elliptical.
(3)  The stress intensity factor ranges, Δ Kb and db/dN, at the location where the intergranular facet disappeared were nearly constant for SM41B and roll clad steel.


(Received 1986/9/3)

Keywords:

roll clad steel, overlaying clad steel, fatigue crack growth rate, surface crack, fractography, mild steel-stainless steel, chromium-molybdenum steel-stainless steel


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